feifei-23求教

23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.

The argument depends on which one of the following assumptions?

A.        More than one or two airplanes were scheduled for the nine canceled flights.

B.        Swift Airlines has fewer mechanical problems than do other airlines of the same size.

C.        Each of the canceled flights would have been longer than the average flight on Swift Airlines.

D.       Swift Airlines had never before canceled more than one or two scheduled flights on a single day.

E.     All of the airplanes scheduled for the canceled flights are based at the same airport.

正确答案是A。我却觉得都不对。其他选项固然可以排除，但A好像也不对啊。原文中就已经明确说了“nine scheduled flights ”可见这9个航班都是scheduled，A说More than one or two airplanes were scheduled ，这不是明摆着吗？那A还有什么意义呢？不知道是不是我对这个选项本身的理解就不对？

注意However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day这个假设的存在，可以得出结论some of the nine cancellations were probably due to something else

因此结论的前提就是这一假设的成立，即More than one or two airplanes were scheduled for the nine canceled flights